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Posted by Rob on October 20, 2005 at 19:14:50:
In Reply to: Re: HB Smith old boiler/furnace instruction manual posted by Mark on December 17, 2004 at 08:52:09:
HeatPro - you wrote:
"Drain the sight glass at least monthly for the same reasons. There are valve handles at top and bottom of the sight glass. Close the bottom hand valve knob. At the bottom of the sight glass fitting there is a small knob with some bumps that you can turn to drain the sight glass. Open the bottom hand valve after the water is out and the bottom sight glass drain valve closed to see if water rises in the glass. If water does not rise, the bottom valve passage is clogged and needs to be removed and cleared (best done by an experienced pro.) If the water does rise, it will probably be rusty, so you can open the bottom drain valve several times til the water runs somewhat clear. Don't forget to turn the power back on when you are done."
My question is: in normal operation, how are the valves below and above the sight valve, supposed to be? Both open? Both closed? One open, one closed? My kid was messing around with the valves and I am not sure if they should be open or closed. Thanks.
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